Leaking Water Sand Filter

by Coleen Smith
(Winnie, TX )

My system is leaking water on top of the sand filter system.

It is leaking from under the valve on top of the system.

Thanks for the question Coleen

It would be good to know the make and model of the sand filter. It makes troubleshooting a little easier, but here are some general guidelines that you can follow.

If there's an air release/bleeder valve on top of the filter, the gasket or O-ring in it might be worn out or broken. You can simply unscrew the bleeder valve and install a new gasket.

If the water is coming out from underneath the lid, you'll need to unscrew the lid and check the gasket. Replace it if it's worn out.

Be sure to use a silicone based lubricant like Magic Lube on the threads. Also make sure there's no sand on the threads of the lid when screwing the lid back on the top of the filter. If you have trouble unscrewing the lid, you might need a lid wrench.


Check for cracks on top of the filter. If the filter is cracked, there's no easy fix. Normally you'll need to replace the filter.

To post a reply, or if you have a similar question, you can see your post on the Q&A page in the "Sand Filters" category.

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Hope this helps and have a great Summer.


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Why Do I Have A Leaking Filter?

by Stephanie
(Dahlonega, GA)

I have a sand filter that is leaking a good amount of water.

We have replaced the O ring and tightened the plastic piece that keeps the dial on top but we are still leaking water.

It goes below the skimmer level everyday. Please help before I divorce over a pool.

Thanks for the question Stephanie

First I'd like to ask if the actual filter is leaking, or is the pool losing water? If the filter is leaking you would have water on the ground and around the filter.

Is this the problem?

Is the water coming out of the back wash hose? If so, you can go these posts for the answer:

Water Coming Out Backwash Hose? I Need Help

Water Coming Out Backwash Hose During Filtration

Multiport Valve Filter Setting Issue..Water Coming Out Of The Backwash Hose..

Next is to troubleshoot why your pool is losing water.

Sand Filter Draining When In "Filter" Position

Mark the water level at the skimmer. You can use a piece of tape or a grease pencil. Check the water level in 24 hours.

Your pool shouldn't lose any more than 1/4" of water per day.

Anything more and you probably have a leak. This test needs to be performed with the pump on, then off, each time for the period of 24 hours.

If the water drops below the skimmer and stops, more than likely the leak is probably in the skimmer, filtration system, or filtration piping.

If it drops below the light, and maybe keeps going, there may be a leak in the drain at the bottom the pool. If the water stops at the light, it's probably the light housing.

If there are air bubbles going back into the pool through the returns, there's a leak in the suction side of the filtration system.

One of the most common leaks is a separation or crack between the plastic skimmer and the concrete pool.

This can be fixed with pool putty.

Here's a good post about how to troubleshoot a leaking pool:

Water Emptying Out Of My Pool Through Sewer Drain At All Settings...

Try the tips above for the filter and testing to see if you're losing water from a leak and let me know how it turns out for you.

Hope this helps and have a great Summer.


By: Stephanie
Date: July 24, 2011

Thank you for your response. We have a Waterway sand filter. It is leaking right at the split nut.

We have replaced and lubed the new o ring but we still have a massive leak. Do you think, replacing the split nut would repair this leak?

By: Robert
Date: July 24, 2011

You can replace the plastic split nut. For Waterway, it attaches the valve to the filter tank.

If the leak is there, then replacing the nut would more than likely stop the leak.

Good luck with it and keep me informed.


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In Ground Hot Tub Draining

by Josh
(New Mexico)

I just used the "recirculate" option on my pump for my in ground hot tub, or "dream spa".

All the water was drained , yet its been about an hour and no water has come back to the hot tub.

Help please?


Thanks for the question Josh

I'm not too sure why the hot tub drained while on RECIRCULATE. I'm wondering if you meant WASTE. RECIRCULATE is really a troubleshooting position more than anything. If you put the dial on RECIRCULATE you simply bypass the filter and the water just goes back into the hot tub through the jets.

Is your hot tub connected to a pool? If this is the case it might be that your valve actuator is bad. A Jandy actuator has 3 positions - dip switch......on1 - off - on2. If the motor doesn't turn the valve when the dip switch is turned on, the actuator is probably bad. A common one is also a Compool CVA 24.

If you don't feel comfortable doing this or checking the valve actuator, it's best to call a hot tub or pool tech.

Hope this helps and if it doesn't you can email back with what you found and we can go from there.

Best of luck.


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